Perhaps you should try some spelling variations:
a literatura » la literatura, a literature, y literatura
filosofia a » filosofia da, filosofia la, filosofia e
texts der » textes der, texts under, texts derek
studium 8 » studium _, studium 1, studium im
studium 3 » studium _, studium 1, studium im

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "texts der ((studium 8) OR (studium 3)) filosofia a literatura".
• Adding a wildcard symbol may retrieve word variants: texts der ((studium 8) OR (studium 3)) filosofia a literatura*.